Pulp-screen and breast-roll box for paper-machines



(No Model.) 2 Sheets-Sheet 1.

0.. BREMAKER. Pulp Screen and Breast R011 Box for Paper Machines.

No. 242,428. Patented June 7,1881.

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2 R E K A M E R B 0 Pulp Screen and Breast R011 Box for Paper Machines.

Patented June 7; 1881.

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HNVENTOR.

WITNESSES NITED STATES;

PATENT OFFICE. v

CHARLES BREMAKER, OF LOUISVILLE, KENTUCKY.

PULP-SCREEN AND BREAST-ROLL BOX PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 242,428, dated June '7,1881.

Application filed April 16, 1881. (No model.)

of the city of Louisville, in the county of Jef-j ferson and State ofKentucky, have invented a certain new and useful Improvement in Pulp-Screens andBreast-Roll Boxes for Paper-Machines; and I do hereby declarethat the following is a full, clear, and exact description of theconstruction and operation of the same, ref erence being bad to theaccompanying drawings, forming part ofthis specification.

This my invention relates to a certain new and useful improvement inpulp-screen and breast-roll boxes, which are made of wood and in form asshown in the drawings, and securely bolted together at the ends, with anelastic or yielding bottom made of prepared cotton duck, prepared paper,and a double thickness of leather placed together,with metal bars aboveand below, and secured to the box-frame by means of screws through thebars and bottom up into the frame above, with the corners of the barsrounded next to the bottom to prevent cutting the bottom, which ispartially covered with wood on the inside in order to give solidity to asufficient portion of it to receive the jack-hangers and cam-blocks bywhich it is operated,which is done by means of a revolving disk withinvolute shaped points working; against a die on the under side of thecamblocks, thereby causing the bot-tom to rise gradually but fallsuddenly, causing a constant drop motion in its operation.

This invention further consists in the addition of certaincross-partitions and slides near the ends of the breast-roll box, asshown, for the purpose of regulating the height of the pulp in thescreen-box, to preventflooding and to regulate the flow into thebreast-roll box, which is further provided with a valve of peculiarconstruction to regulate the discharge of the pulp.

The object of this my invention is to provideapulp-screen box of durableconstruction, having an elastic or yielding bottom consisting ofprepared cotton duck, prepared paper, and a double thickness of leatherplaced together in sheets and held together by metal bars above andbelow, and secured to the box-frame by means of screws through bars andbottom up into the frame, with the corners of the bars rounded toprevent cutting, thereby forming a box with a strong, elastic, yieldingbottom, perfectly water-tight, and not liable to get out of order orbreak where it connects with the box and wood covering on the inside, bythe constant shock caused by the drop motion of the bottom in itsoperation.

I attain the above objects by the mechanism illustrated in theaccompanying drawings, in which Figure l is asectional view of thepulp-screen box, with the frame cutaway to show the mechanism by whichit. is operated. Fig. 2 is a cross-section, taken asindicated bymw,sh0wing the elastic bottom and the several devices by which it isoperated. Fig. 3 isalso a crosssection of the screen-box, taken asindicated by g 3 showing part of the box and the yielding bottom andmechanism by which it is operated. Fig. 4 is a perspective view of thebreast-roll box, showing the parallel partition and cross-partitions,with their slides, and the discharge-valve c0mpartment. Fig. 5 is aperspective view of the screen box and frame, show in g part of thescreen-plates and the dischargeopenings at the side. Fig. 6 is asectional view of the screw for regulating the drop of the screen-boxbottom, showing the lock-nut thereon. Fig.7 is a sectional view of thescrew-and gearing for regulating the discharge-valve of the breast-rollbox. Fig. 8 is a sectional view of the pipes which connect thescreen-box with the breast-roll box, showing the loose flange used onthe inside.

Similar letters refer to similar parts throughout the several views.

This my invention will be more fully illustrated in detail in thedrawings, in which- A A represent the frame of the machine, which ismade of wood, framed and bolted together as shown in the drawings, withthe top edges beveled on the inside.

B B are the parallel beams, upon which the operating mechanism rests,and to which it is secured. a

O G are the upper, and D D the lower, parts of the pulp-screen box,which is made of wood about six and one-half feet long and three feetseven inches wide, and of material three and one-half inches thick,slightly halved or dovetailed at the corners, and secured firmlytogether by means of bolts through the entire end pieces.

E E are the hinges by which the parts are connected.

F is a gum gasket inserted in the edges of the screen-box to form awater-tight joint.

HHare lugs on the side, by which the parts are held together.

I I are cross -bars in the upper part of the box, and upon which thescreen-platesJ J rest, which plates are made of metal and in form asshown.

KKare brass or metal bars, about one and three-fourths of an inch wideby half an inch thick, let into the lower edge of the box-frame on theinside their full thickness, with the corners rounded to prevent cuttingthe bottom. L is a gum gasket placed over these bars to form awater-tight joint.

G is a sheet of prepared cotton duck stretched over the lower edge ofthe box.

N is a sheet of prepared paper, and O is a double thickness of leather,all of which are held together and secured to the lower edge of thebox-frame D by means of screws through corresponding metal bars aboveand below, and series of sheets constituting the bottom, up into theframe above. The difference between the width of the bar It and thethickness of the box-frame D is made up by thin strips of wood to form asmooth level surface across the edges, where they rest upon the frame,to which it is bolted, as shown in the drawings.

The inside of the bottom S is nearly covered with wood T, about twoinches thick, chamfered at the sides and ends, leaving a space of aboutfive inches between it and the sides and ends of the box.

U U are metal bars, similar to those on the box, let into the under sideof the wood covering T around the edges, with the corners rounded toprevent cutting the bottom, and are secured thereto by means of screwsthrough similar bars, V V, under the bottom, up into the wood above.

The edges of all the above-named bars U V and RK are rounded to preventwearing or cutting the bottom by its rising and drop motion while inoperation.

W is the cam-block, which is secured to the under side of the box-bottomS, between the bars V V, with a projection on the under side extendingdown nearly to the disk 0 with a groove about one and a half inch squarein the under surface, slightly dovetailed on the side, with a steel die,Z, fitted therein and secured by a set-screw, A, at the side. The lowersurface of the die Z is formed to correspond with the shape of the diskpoints D, which work against it, and in order to relieve the bottom Sfrom the strain caused by the weight and sudden shock required in itsoperation, a yoke or hanger, B, formed as shown,

is secured to the bottom between the bars V V, extending down below theshaft N, leaving a small space below for vibration. The lower ends ofthe hangers B are provided with strong caps E, secured thereto, having aprojection on the under side, with a recess or opening extending nearlythrough the projection, slightly dovetailed on the inside, with a blockof hard wood, F, fitted therein, and secured by means of a wedge in thecenter and a pin through both metal and wood, which extends slightlybelow the metal, and is intended for the purpose of relieving the bottomof the shock caused by its constant dropping upon the head of theregulating-screw G, and to prevent noise. These screws G are providedwith large round heads, made flat on the top and inserted in a strongplate, H, resting on the frameB, with a hexagon nut, J, and sleeve L 011the top, which is made tapering on the outside and threaded both insideand outside, with a slit, K, in the side, leaving a slight open space inthe sleeve, which is closed upon the screw by the corresponding nut J,when screwed down over it, thereby forming a locknnt for the screw.

N is the main driving-shaft, and O is the disk.

D are the involute points that operate the bottom S.

O is the shaft-bearings, and P is the pulley.

Q are oil stands or cups, in which the disks 0 revolve in order to keepthem lubricated.

R are discharge-openings in the screen-box D, and S is the breast-rollbox, which is made of wood and in form as shown in the drawings.

T is the central division, and U is the lower opening, through which thepulp passes into the next compartment.

V are cross-partitions near the ends, forming receptacles for the pulpas it enters them from the openings R, and W are slides on thesepartitions for the purpose of regulating the height of the pulp in thescreen-box, and to prevent overflowing the breast-roll box.

X is a false bottom in the box S.

Y is an opening, through which the pulp rises in discharging itselfthrough the openin g Z.

A is a valve over the opening Y, which is made in form as shown, andsufficiently long to cover the opening, with slight rises on the edgesof the lower surface, to form a more perfeet seat when dressed true toprevent leakage, and is further prevented from turning by small lugs atthe corners, resting against the sides of the box.

B is the valvestem, which is made with a square head recessed into thevalve and cap to prevent turning, and secured therein by bolts throughthe cap, in such a manner as to "ibrate slightly to keep the valveproperly seated.

C is a plate on the box S, and D are gearingwheels, one of which has aboss on the back working loosely in the plate C and is held in its placeby a flange under the plate, and is made to answer as a nut for thescrew, to raise and lower the valve without turning the screw. 7

E is a cover of the discharge part of the breast-roll box.

F are the brackets upon which the box rests.

G2 are flat pipes for connecting the boxes, one end of which is providedwith a separate flange to be used on the inside of the breastroll box toassist in securing the pipes thereto.

I am aware that pulp-screen boxes have been used with flexible bottomspartially covered with wood on the under side and operated by anirregular-formed disk; but so far as I am aware no boxes have been inuse having a bottom composed of prepared cotton duck, prepared paper,and leather in sheets, covering the entire bottom and secured to the boxby means of screws through metal bars above and below into the boxabove, with the corners of the bars rounded to prevent cutting thebottom, which is partially covcred'with wood on the inside to render aportion of it solid, in order to attach thereto the operating mechanism.Therefore I do not broadly claim a flexible bottom; but

What I do claim as my invention, and desire to secureby Letters Patentin pulp-screen boxes for making paper, is

1. The composition bottom S, consisting of a sheet of prepared cottonduck, G, a sheet of prepared paper, N, and a double sheet of leather, 0,in combination with the frame D, substantially as herein described, andfor the purpose set forth.

2. In a pulp-screen box having a composition bottom, S, consisting ofprepared cotton duck G, preparedpaper N, and leather 0, the metal bars KR and U V, with rounded corners, in combination with the interior woodcovering, T, pipes G and flange H substan- 3 5 tially as described, andfor the purpose set forth.

3. In a pulp-screen box having composition bottom S, the yokes B, woodfilling F, and adjusting-screws G, in combination with the 4,0 nut J,sleeve L, slit K, and. jam-nut J substantially as described, and for thepurpose set forth.

4. In a pulp-screen box, the cam-blocks W, steel die Z, and disk 0 withits involute points 4 5 D, in combination with the shaft N, by which itis operated, substantially as herein described, and for the purpose setforth.

5. In a breast-roll box, the combination of the cross-partitions V andslides W, substano tially as herein described, and for the purpose setforth.

6. The combination of the valve A stem B plate 0 and gearing D by whichit is operated, substantially as herein described, and for 5 5 thepurpose set forth.

CHARLES BREMAKER.

Witnesses:

FRANK PARDON, G. HEWITT.-

